Burner, gasification furnace provided with burner, and burner attaching method

ABSTRACT

The purpose of the present invention is to improve workability when installing a cooling pipe and a burner oxidizer supply pipe through which fuel and an oxidizer are supplied to a combustion furnace or the like of a gasifier. A burner (2) is provided with: an air supply pipe (8) through which air is supplied into a combustion furnace (1); a cooling pipe (6) that is provided so as to surround a supply pipe (5); and a closed flange (7) which is detachably fixed to a furnace wall and to which the air supply pipe (8) and the cooling pipe (6) are fixed. The tip of the cooling pipe (6) on a furnace inside is arranged to project to the furnace inside more than the tip of the supply pipe (5) by a projection allowance length (L1).

TECHNICAL FIELD

The present invention relates to a burner used for a combustion furnace, a gasifier provided with a burner, and a burner attaching method.

BACKGROUND ART

A gasifier (combustion furnace) of a gasification apparatus which gasifies a carbon containing fuel deals with a high temperature exceeding 1,500° C. As a burner used for the gasifier, a burner in the related art disclosed in PTL 1 is known.

In the related art disclosed in PTL 1, the burner is installed in a state where a tip thereof is located inside a furnace. A burner cooling water pipe is wound around a burner supply pipe. PTL 1 discloses the following configuration. The burner cooling water pipe is installed in a state where the burner cooling water pipe is in contact with a periphery of the burner supply pipe, and is disposed outward of the furnace from a tip of the burner supply pipe. In the burner cooling water pipe, cooling water circulates so as to cool the burner supply pipe.

CITATION LIST Patent Literature

[PTL 1] Japanese Patent No. 5968247

SUMMARY OF INVENTION Technical Problem

In the burner configured in this way, a protruding amount of the tip of the burner supply pipe protruding into the furnace is an important factor for determining a state where combustion inside the furnace is performed by the burner. Accordingly, the protruding amount needs to be accurately managed. In addition, in order to protect the burner supply pipe from combustion heat generated by flames formed inside the furnace, cooling water is caused to flow inside the burner cooling pipe. A positional relationship between the burner supply pipe and the burner cooling water pipe greatly influences cooling performance for the burner supply pipe. Furthermore, the vicinity of a furnace inner tip of the burner needs to ensure the cooling performance while the burner cooling pipe receives influence of wear caused by pulverized coal blown from the burner. Accordingly, when the burner supply pipe and the burner cooling water pipe are arranged, both of these need to be very accurately installed.

According to the configuration disclosed in PTL 1, the burner supply pipe and the burner cooling water pipe are separated from each other. Accordingly, when the burner supply pipe and the burner cooling water pipe are attached to the combustion furnace, it is necessary to very accurately align the burner supply pipe and the burner cooling water pipe with each other in a job site, thereby causing a problem in that much time is required for an attaching step in the job site.

The present invention is made in view of the above-described circumstances, and an object thereof is to provide a burner, a gasifier provided with a burner, and a burner attaching method, which can improve workability in installing an oxygen containing gas supply pipe and a cooling pipe of the burner for supplying a fuel and oxygen containing gas to a combustion furnace of the gasifier.

Solution to Problem

In order to solve the above-described problem, a burner, a gasifier provided with a burner, and a burner attaching method according to the present invention adopt the following means.

According to an aspect of the present invention, there is provided a burner including an oxygen containing gas supply pipe that supplies oxygen containing gas into a furnace, a fuel supply pipe that is coaxially located inside the oxygen containing gas supply pipe so as to supply a fuel and oxygen containing gas, a cooling pipe disposed so as to surround the oxygen containing gas supply pipe, and a flange to which the oxygen containing gas supply pipe and the cooling pipe are fixed, and which is detachably fixed to a furnace wall.

According to the above-described configuration, the oxygen containing gas supply pipe and the cooling pipe are fixed to the flange. Accordingly, the oxygen containing gas supply pipe and the cooling pipe can be installed in the gasifier simply by fixing the flange to the furnace wall. In addition, the oxygen containing gas supply pipe and the cooling pipe are fixed to the flange. Accordingly, the oxygen containing gas supply pipe and the cooling pipe can be transported without any change in a state where both of these are arranged at a desired relative position. In this manner, a place where the oxygen containing gas supply pipe and the cooling pipe are arranged at the desired relative position and a place where the oxygen containing gas supply pipe and the cooling pipe are installed in the combustion furnace of the gasifier can be located separate from each other. Therefore, for example, in a case where the oxygen containing gas supply pipe and the cooling pipe are fixed to the flange at the factory, at the job site where the oxygen containing gas supply pipe and the cooling pipe are installed in the combustion furnace of the gasifier, the oxygen containing gas supply pipe and the cooling pipe can be installed at the desired relative position in the gasifier simply by fixing the flange to the furnace wall. Therefore, it is possible to omit work for adjusting a relative position between the oxygen containing gas supply pipe and the cooling pipe at the job site. Therefore, it is possible to improve workability in installing the oxygen containing gas supply pipe and the cooling pipe in the gasifier.

In addition, the flange is detachably fixed to the furnace wall. Accordingly, in a case where the oxygen containing gas supply pipe or the cooling pipe is exchanged, the flange can be easily detached from the furnace wall, and thus, both of these can be easily exchanged.

In addition, in the burner according to the aspect of the present invention, a tip portion inside the furnace of the cooling pipe may be located inside the furnace as much as a predetermined length from a tip portion of the oxygen containing gas supply pipe inside the furnace.

According to the above-described configuration, the tip portion of the cooling pipe is located inside the furnace as much as the predetermined length from the tip portion of the oxygen containing gas supply pipe. Even in a case of the burner requiring high accuracy in relative alignment between the oxygen containing gas supply pipe and the cooling pipe, the place where the oxygen containing gas supply pipe and the cooling pipe are arranged at the desired relative position and the place where the oxygen containing gas supply pipe and the cooling pipe are installed in the combustion furnace of the gasifier can be located separate from each other. Therefore, for example, in a case where the oxygen containing gas supply pipe and the cooling pipe are fixed to the flange at the factory, the workability can be further improved at the job site where the oxygen containing gas supply pipe and the cooling pipe are installed in the combustion furnace of the gasifier.

According to another aspect of the present invention, there is provided a gasifier including the burner. According to the gasifier configured in this way, it is possible to improve the workability in installing the oxygen containing gas supply pipe and the cooling pipe. In addition, the oxygen containing gas supply pipe or the cooling pipe can be easily exchanged.

According to still another aspect of the present invention, there is provided a burner attaching method for a burner including an oxygen containing gas supply pipe that supplies oxygen containing gas into a furnace, an oxygen containing gas fuel supply pipe that is coaxially located inside the oxygen containing gas supply pipe so as to supply a fuel and oxygen containing gas, a cooling pipe disposed so as to surround the oxygen containing gas supply pipe, and a flange to which the oxygen containing gas supply pipe and the cooling pipe are fixed, and which is detachably fixed to a furnace wall. The burner attaching method includes a supply pipe fixing step of fixing the oxygen containing gas supply pipe to the flange, a cooling pipe fixing step of fixing the cooling pipe to the flange, and a flange fixing step of detachably fixing the flange to the furnace wall after the supply pipe fixing step and the cooling pipe fixing step. A position where the oxygen containing gas supply pipe and the cooling pipe protrude into the furnace is managed through the flange fixing step.

According to the above-described configuration, the oxygen containing gas supply pipe and the cooling pipe are fixed to the flange. Accordingly, the oxygen containing gas supply pipe and the cooling pipe can be installed in the combustion furnace of the gasifier simply by fixing the flange to the furnace wall. The flange is fixed to the furnace wall after the oxygen containing gas supply pipe and the cooling pipe are fixed to the flange. Accordingly, the oxygen containing gas supply pipe and the cooling pipe can be transported without any change in a state where both of these are arranged at the desired relative position. Therefore, the place where the oxygen containing gas supply pipe and the cooling pipe are arranged at the desired relative position and the place where the oxygen containing gas supply pipe and the cooling pipe are installed in the gasifier do not need to be the same place, and can be located separate from each other. The place where the oxygen containing gas supply pipe and the cooling pipe are arranged at the desired relative position does not need to be located in the vicinity of the gasifier. Therefore, it is possible to improve the workability in installing the oxygen containing gas supply pipe and the cooling pipe in the gasifier.

In addition, the flange is detachably fixed to the furnace wall. Accordingly, in a case where the oxygen containing gas supply pipe or the cooling pipe is exchanged, the flange can be easily detached from the furnace wall, and thus, both of these can be easily exchanged.

In addition, the burner attaching method according to the aspect of the present invention may further include a transportation step of transporting the flange to which the oxygen containing gas supply pipe and the cooling pipe are fixed. The supply pipe fixing step and the cooling pipe fixing step may be performed at a factory. The flange fixing step may be performed at a job site where the oxygen containing gas supply pipe and the cooling pipe are installed in a combustion furnace having the furnace wall, after the transportation step.

According to the above-described configuration, the oxygen containing gas supply pipe and the cooling pipe are fixed to the flange at the factory, and are transported without any change in a fixed state. Accordingly, at the job site where the oxygen containing gas supply pipe and the cooling pipe are installed in the combustion furnace of the gasifier, the oxygen containing gas supply pipe and the cooling pipe can be installed at the desired relative position in the gasifier simply by fixing the flange to the furnace wall. Therefore, it is possible to omit work for adjusting the relative position between the oxygen containing gas supply pipe and the coding pipe at the job site. Therefore, it is possible to preferably improve the workability in installing the oxygen containing gas supply pipe and the cooling pipe in the gasifier.

Advantageous Effects of Invention

According to the present invention, it is possible to improve the workability in installing the supply pipe and the cooling pipe of the burner, through which the fuel and the oxygen containing gas are supplied to the combustion furnace of the gasifier.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a longitudinal sectional view of a burner according to an embodiment of the present invention.

FIG. 2 is a side view of the burner in FIG. 1.

FIG. 3 is a schematic configuration diagram of a gasifier according to the embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

Hereinafter, an embodiment of a burner, a gasifier provided with a burner, and a burner attaching method according to the present invention will be described with reference to FIGS. 1 to 3.

The burner according to the present embodiment is disposed in a coal gasifier (gasifier) 30 illustrated in FIG. 3.

The coal gasifier 30 is formed to extend in a vertical direction. Pulverized coal and oxygen are supplied to a lower side in the vertical direction, and raw syngas gasified through partial combustion circulates from the lower side to an upper side in the vertical direction. The coal gasifier 30 has a pressure vessel 110 and a gasifier wall (furnace wall) 111 disposed inside the pressure vessel 110. Then, in the coal gasifier 30, an annulus part 115 is formed in a space between the pressure vessel 110 and the gasifier wall 111. In addition, in an internal space of the gasifier wall 111, the coal gasifier 30 has a combustor unit 116, a diffuser unit 117, and a redactor unit 118 in the space inside the gasifier wall 111 sequentially from the lower side in the vertical direction (that is, an upstream side in a circulating direction of the raw syngas).

The pressure vessel 110 is formed in a cylindrical shape whose interior serves as a hollow space, and a gas outlet 121 is formed in an upper end portion thereof. In contrast, a slag bath 122 is formed in a lower end portion (bottom portion) thereof. The gasifier wall 111 is formed in a cylindrical shape whose interior serves as a hollow space, and a wall surface thereof is disposed so as to face the inner surface of the pressure vessel 110. According to the present embodiment, the pressure vessel 110 has a cylindrical shape, and the diffuser unit 117 of the gasifier wall 111 is also formed in a cylindrical shape. The gasifier wall 111 is connected to the inner surface of the pressure vessel 110 by a support member (not illustrated).

In the gasifier wall 111, the interior of the pressure vessel 110 is separated into an internal space 154 and an external space 156. Although details will be described later, a cross-sectional shape of the gasifier wall 111 varies in the diffuser unit 117 between the combustor unit 116 and the reductor unit 118. In the gasifier wall 111, an upper end portion thereof which is a vertically upper side is connected to the gas outlet 121 of the pressure vessel 110, and a lower end portion thereof which is a vertically lower side is disposed with a gap from a bottom portion of the pressure vessel 110. Then, water is stored in the slag bath 122 formed in the bottom portion of the pressure vessel 110. The lower end portion of the gasifier wall 111 is immersed in the stored water, thereby sealing the interior and exterior of the gasifier wall 111. Burners 126 and 127 are inserted into the gasifier wall 111, and a syngas cooler 102 is located in the internal space 154. A structure of the gasifier wall 111 will be described later.

The annulus part 115 is a space formed inside the pressure vessel 110 and outside the gasifier wall 111, that is, the external space 156. Nitrogen serving as inert gas separated by an air separation unit 42 is supplied to the annulus part 115 through a nitrogen supply line (not illustrated). Therefore, the annulus part 115 is a space filled with the nitrogen. A furnace internal pressure equalizing pipe (not illustrated) for equalizing the pressure inside the gasifier 101 is disposed in the vicinity of the upper portion in the vertical direction of the annulus part 115. The furnace internal pressure equalizing pipe is disposed so as to allow the interior and the exterior of the gasifier wall 111 to communicate with each other. In this manner, the pressure is substantially equalized so that a pressure difference between the interior (the combustor unit 116, the diffuser unit 117, and the reductor unit 118) and the exterior (the annulus part 115) of the gasifier wall 111 falls within predetermined pressure.

The combustor unit 116 is a space for partially combusting the pulverized coal, char, and air. A combustion device including a plurality of burners 126 is located on the gasifier wall 111 in the combustor unit 116. High temperature combustion gas used in partially combusting the pulverized coal and the char in the combustor unit 116 passes through the diffuser unit 117, and flows into the reductor unit 118.

The reductor unit 118 is a space configured as follows. The space maintains a high temperature state required for gasification reaction, and the pulverized coal is supplied to the combustion gas from the combustor unit 116 so as to partially combust the pulverized coal. The pulverized coal is resolved into volatile components (carbon monoxide, hydrogen, and lower hydrocarbon), and is gasified so to produce the raw syngas. Combustion equipment including a plurality of burners 127 is located on the gasifier wall 111 in the reductor unit 118.

The syngas cooler 102 is disposed inside the gasifier wall 111, and is disposed on the upper side of the reductor unit 118 in the vertical direction of the burner 127. The syngas cooler 102 is a heat exchanger, and has an evaporator (evaporator) 131, a superheater (superheater) 132, and a coal economizer (economizer) 134 in this order from the lower side (upstream side in the circulating direction of the raw syngas) in the vertical direction of the gasifier wall 111. The syngas coolers 102 cool the raw syngas by exchanging heat with the raw syngas through heat exchange with the raw syngas produced in the reductor unit 118. In addition, the evaporator (evaporator) 131, the superheater (super heater) 132, and the economizer (economizer) 134 are not limited to the illustrated number.

Here, an operation of the gasifier 30 will be described.

In the coal gasifier 30, the nitrogen and the pulverized coal are loaded into and ignited by the burner 127 of the reductor unit 118, and the pulverized coal, the char, and compressed air (oxygen) are loaded into and ignited by the burner 126 of the combustor unit 116. Then, in the combustor unit 116, high temperature combustion gas is generated due to combustion of the pulverized coal and the char. In the combustor unit 116, molten slag is generated in the high temperature gas due to the combustion of the pulverized coal and the char. The molten slag adheres to the gasifier wall 111, and drops to a furnace bottom. Finally, the molten slag is discharged to the water stored in the slag bath 122. Then, the high temperature combustion gas generated in the combustor unit 116 ascends to the reductor unit 118 through the diffuser unit 117. In the reductor unit 118, a high temperature state required for gasification reaction is maintained, and the pulverized coal is mixed with the high temperature combustion gas. The pulverized coal is partially combusted in a high temperature reducing atmosphere, and the gasification reaction is performed, thereby producing the raw syngas. The gasified raw syngas flows from the lower side to the upper side in the vertical direction.

Next, a structure around the burner 2 according to the present embodiment will be described in detail with reference to FIGS. 1 and 2. For example, the burner 2 according to the present embodiment is applied to the burner 126 or the burner 127 (refer to FIG. 3) disposed on the gasifier wall 111 in the combustion furnace such as the combustor unit 116 and the reductor unit 118 of the coal gasifier 30.

As illustrated in FIG. 3, the coal gasifier 30 obtains the production gas (flammable gas) as follows. The pulverized coal and char (unreacted portion of coal and ash content) which are pulverized by a coal beater (not illustrated) are partially combusted using the oxygen containing gas. According to the present embodiment, the air is used as the oxygen containing gas. The combustion furnace 1 generates combustion heat by combusting the pulverized coal and char, and supplies a heat quantity required for the gasification reaction and a heat quantity required for melting slag in the reductor unit 118 located on the downstream side.

As described above, the plurality of burners 2 are disposed around the combustion furnace 1. One of the burners 2 is illustrated in Figs. 1 and 2. The burner 2 is inserted into an opening portion 3 formed on the gasifier wall 111 (refer to FIG. 3). The gasifier wall 111 includes a plurality of furnace wall pipes 4 (one of the furnace wall pipes 4 is illustrated in FIG. 1) extending in parallel in the vertically upward-downward direction. The cooling water flows inside the furnace wall pipe 4. The opening portion 3 formed on the gasifier wall 111 is formed in such a way that a portion of the furnace wall pipe 4 is laterally bent outward (rightward in FIG. 1) of the furnace (right side in FIG. 1).

The burner 2 includes a supply pipe 5 located from the outside of the furnace to the inside of the furnace, a cooling pipe 6 wound around this supply pipe 5, and a blank flange (flange) 7 to which the supply pipe 5 and the cooling pipe 6 are fixed.

The supply pipe 5 has an air supply pipe 8 (oxygen containing gas supply pipe) which configures the outer diameter of the supply pipe 5, and an annular plate-shaped supply pipe flange portion 10 extending from an outer peripheral surface of a furnace outer end portion of the air supply pipe 8 in a direction orthogonal to the outer peripheral surface. A fuel supply pipe 9 extending in the same direction as the air supply pipe 8 and having the common axial center in the longitudinal direction is installed inside the air supply pipe 8. A furnace inner tip of the fuel supply pipe 9 is located outside the furnace so as to move rearward of the inside of the furnace from the furnace inner tip of the air supply pipe 8. As the fuel inside the fuel supply pipe 9, the pulverized coal and the char circulate from a fuel gas supply line (not illustrated) together with primary air for transportation. In addition, the outer surface of the fuel supply pipe 9 and the inner surface of the air supply pipe 8 are arranged so as to be separated from each other. The air (secondary air) circulates in a space between the outer surface of the fuel supply pipe 9 and the inner surface of the air supply pipe 8. The supply pipe flange portion 10 has a bolt insertion hole 11 for fixing a furnace outer pipe flange portion 13 (to be described later) and a bolt (not illustrated) to each other. A flame is formed inside the furnace by the fuel and the air which are supplied from the supply pipe 5.

The furnace outer end portion of the air supply pipe 8 is connected to the furnace outer pipe 12 located outside the furnace. The outer diameter of the furnace outer pipe 12 is slightly smaller than the inner diameter of the air supply pipe 8. The end portion of the furnace outer pipe 12 is inserted into the air supply pipe 8 so that the air supply pipe 8 and the furnace outer pipe 12 are connected to each other. The outer peripheral surface of the furnace outer pipe 12 has an annular plate-shaped furnace outer pipe flange portion 13 extending in a direction orthogonal to the outer peripheral surface. A fixing location A1 between the furnace outer pipe 12 and the furnace outer pipe flange portion 13 is fixed by means of welding. The furnace outer pipe flange portion 13 has a bolt insertion hole 14 for fixing the supply pipe flange portion 10 and a bolt (not illustrated) to each other.

The cooling pipe 6 has cooling water (cooling medium) circulating therein, and has a first cooling pipe 15 and a second cooling pipe 16 located in a furnace outward direction from the first cooling pipe 15. The first cooling pipe 15 is located so as to spirally surround the supply pipe 5 in a state of being in contact with the outer peripheral surface of the supply pipe 5 (air supply pipe 8). The furnace inner tip portion of the first cooling pipe 15 is located so as to protrude inward of the furnace as much as a protrusion allowance length L1 (refer to FIG. 1) from the tip portion of the supply pipe 5. As will be described later, the burner 2 is attached to the fixing member 22 fixed to a seal box 20 by a blank flange 7. Thereafter, the second cooling pipe 16 is continuously connected to an upstream end and a downstream end of the first cooling pipe 15 by means of welding. That is, the first cooling pipe 15 and the second cooling pipe 16 serve as a series of continuous cooling pipes 6. From a viewpoint of resisting corrosion resistance and thermal fatigue caused by repeated thermal stress, the cooling pipe 6 is formed of a Ni-based alloy or a Ni-containing alloy (Inconel 625), for example.

As illustrated in FIG. 2, the blank flange 7 is an annular plate-shaped member, and has a supply pipe insertion hole 17 for inserting the supply pipe 5 into a substantially central portion. For example, the blank flange 7 is formed of stainless steel (SUS316L) in view of heat resistance and corrosion resistance. In addition, the outer peripheral side of the supply pipe insertion hole 17 has two cooling pipe insertion holes 18 for inserting the cooling pipe 6, which are formed on the upper and lower sides of the drawing paper surface. In addition, a plurality of (for example, 16 in the present embodiment) bolt insertion holes 19 are formed along the outer periphery on the outer peripheral side from the cooling pipe insertion hole 18. The bolt insertion hole 19 is a hole for fixing the fixing member 22 fixed to the seal box 20 (to be described later) and the blank flange 7 to each other.

The seal box 20 is disposed outside the furnace so as to cover the opening portion 3 formed by the furnace wall pipe 4. For example, the seal box 20 is formed of stainless steel. The seal box 20 is filled with a refractory material 21. For example, as the refractory material 21, alumina or silica is preferably used. The seal box 20 and the refractory material 21 can maintain the pressure inside the pressurized furnace, and radiation or slag leaking outward of the furnace from a gap between the burner 2 and the opening portion 3 can be prevented from further leaking outward.

The furnace outer surface of the seal box 20 has a fixing member 22 connecting the seal box 20 and the blank flange 7 to each other. The fixing member 22 has a cylinder portion 23 welded and fixed to a fixing location A2 disposed on the furnace outer surface of the seal box 20 and extending in the furnace outward direction, and a fixing member flange portion 24 extending to the furnace outer surface of the seal box 20 from the furnace outer end portion of the cylinder portion 23. The fixing member flange portion 24 has a bolt insertion hole 25 for fixing the blank flange 7.

Next, a fixing mode of the burner 2 according to the present embodiment will be described.

In the burner 2, each portion is fixed, based on the blank flange 7. A fixing location A3 between the blank flange 7 and the supply pipe 5 is welded and fixed. That is, in a state where the supply pipe 5 (air supply pipe 8) is inserted into the supply pipe insertion hole 17 formed in the blank flange 7, the blank flange 7 and the outer surface of the supply pipe 5 are welded and fixed to each other. A fixing location A4 between the blank flange 7 and the cooling pipe 6 is welded and fixed. That is, in a state where the cooling pipe 6 is inserted into the cooling pipe insertion hole 18 formed in the blank flange 7, the blank flange 7 and the outer surface of the cooling pipe 6 (first cooling pipe 15) are welded and fixed to each other. In this way, the blank flange 7, the supply pipe 5, and the cooling pipe 6 are welded and fixed to each other, thereby forming an integrated structure. That is, a furnace inner tip position of the supply pipe 5 and a furnace inner tip position of the cooling pipe 6 (first cooling pipe 15) are fixed to the blank flange 7.

The blank flange 7 and the fixing member 22 are detachably fixed to each other by using a bolt (not illustrated). Specifically, in a state where the bolt insertion hole 19 formed in the blank flange 7 and the bolt insertion hole 25 formed in the fixing member flange portion 24 overlap each other, the blank flange 7 and the fixing member 22 are fastened and fixed to each other by using the bolts (not illustrated) inserted into both the insertion holes 19 and 25. In addition, the supply pipe 5 and the furnace outer pipe 12 are detachably fixed to each other by using a bolt (not illustrated). Specifically, in a state where the bolt insertion hole 11 formed in the supply pipe flange portion 10 and the bolt insertion hole 14 formed in the furnace outer pipe flange portion 13 overlap each other, the blank flange 7 and the fixing member 22 are fastened and fixed to each other by using bolts (not illustrated) inserted into both the insertion holes 11 and 14.

The burner 2 according to the above-described configuration is used as follows.

In the furnace inner tip portion of the supply pipe 5, the fuel and the primary air which are supplied from a source (not illustrated) are injected from the fuel supply pipe 9, and the secondary air is injected from the air supply pipe 8. The fuel and the air which are injected from the furnace inner tip of the supply pipe 5 are loaded into a previously formed fuel region inside the furnace, thereby maintaining a desired combustion state. On the other hand, in order to protect the supply pipe 5 from combustion radiant heat generated by the flame formed inside the furnace, the cooling water flows inside the cooling pipe 6 so as to cool a furnace inner protruding portion of the supply pipe 5. The cooling water is supplied from a cooling water source (not illustrated), and circulates inside the cooling pipe 6. Thereafter, the cooling water flows outward.

Next, an attaching method for the burner 2 according to the present embodiment will be described.

According to the present embodiment, a welding and fixing the supply pipe 5 (air supply pipe 8) and the cooling pipe 6 to the blank flange 7 at the fixing locations A3 and A4 (supply pipe fixing step and cooling pipe fixing step) is performed at a factory. In detail, a step of aligning and fixing the supply pipe 5 and the cooling pipe 6 to the blank flange 7 so that the furnace inner tip portion of the first cooling pipe 15 protrudes inward of the furnace as much as a predetermined protrusion allowance length L1 (refer to FIG. 1) from the tip portion of the supply pipe 5 (air supply pipe 8) is performed at the factory. Thereafter, the blank flange 7 to which the supply pipe 5 and the cooling pipe 6 are fixed is transported to a job site having the combustion furnace 1 installed therein by using predetermined transport means (transportation step). At the job site, the blank flange 7 and the fixing member 22 are fastened to each other by using a bolt, and further the supply pipe 5 and the furnace outer pipe 12 are fastened to each other by using a bolt. In this manner, the supply pipe 5 and the cooling pipe 6 are install in the combustion furnace 1 (flange fixing step).

Thereafter, the second cooling pipe 16 is welded, fixed, and connected to the upstream end and the downstream end of the first cooling pipe 15, and the cooling pipe 6 is continuously connected thereto.

In addition, inside the air supply pipe 8 in the supply pipe 5, the fuel supply pipe 9 is installed so as to extend in the same direction as the air supply pipe 8 and use the longitudinal axis center in common. The furnace inner tip of the fuel supply pipe 9 is installed and fixed so as to be located at a position moved rearward from the inside of the furnace as much as a predetermined length from the furnace inner tip of the air supply pipe 8. In this case, the air supply pipe 8 is aligned with and fixed to the blank flange 7. Accordingly, the fuel supply pipe 9 and the air supply pipe 8 are more easily aligned and installed, compared to the method in the related art.

According to the present embodiment, the following operation effects are achieved.

According to the present embodiment, the supply pipe 5 and the cooling pipe 6 are fixed to the blank flange 7. Accordingly, the supply pipe 5 and the cooling pipe 6 can be installed in the combustion furnace 1 simply by attaching and fixing the blank flange 7 to the fixing member 22 fixed to the seal box 20 of the gasifier wall 111 (refer to FIG. 3). In addition, the supply pipe 5 and the cooling pipe 6 are fixed to the blank flange 7. Accordingly, the supply pipe 5 and the cooling pipe 6 can be transported without any change in a state where the supply pipe 5 and the cooling pipe 6 are arranged at a desired relative position. In this manner, a place where the supply pipe 5 and the cooling pipe 6 are arranged and fixed at the desired relative position and a place where the supply pipe 5 and the cooling pipe 6 are installed in the combustion furnace 1 can be separated from each other.

According to the present embodiment, the furnace inner tip portion of the cooling pipe 6 is located so as to protrude inward of the furnace as much as a predetermined protrusion allowance length L1 (refer to FIG. 1) from the tip portion of the supply pipe 5 (air supply pipe 8). In this manner, the supply pipe 5 is cooled. In this structure, a cooling effect of the supply pipe 5 can be improved by lengthening the protrusion allowance length L1. However, if the protrusion allowance length L1 is excessively lengthened, the fuel (pulverized coal or char) ejected from the fuel supply pipe 9 collides with a protruding portion of the cooling pipe 6, and powder grain wear occurs in the protruding portion, thereby causing a possibility that the protruding portion may be damaged. Therefore, fixing work needs to be carried out by accurately managing the attaching position so that the protrusion allowance length L1 of the protruding portion of the cooling pipe 6 enables the cooling effect to be achieved while the powder grain wear is prevented.

According to the present embodiment, the step of welding and fixing the supply pipe 5 (air supply pipe 8) and the cooling pipe 6 to the blank flange 7 at the fixing locations A3 and A4 is performed at the factory. That is, a process of adjusting the protrusion allowance length L1 of the protruding portion of the cooling pipe 6 to a desired length, which needs high accuracy, is performed at the factory. Then, in a state where the desired protrusion allowance length L1 is maintained, both of these are transported to the job site where the combustion furnace 1 is disposed. Therefore, at the job site for installing the supply pipe 5 and the cooling pipe 6 in the combustion furnace 1, the supply pipe 5 and the cooling pipe 6 can be installed at the desired relative position in the combustion furnace 1 simply by fixing the blank flange 7 to the fixing member 22. Therefore, the work for adjusting the protrusion allowance length L1 of the protruding portion of the cooling pipe 6 to the desired length can be omitted at the job site. Therefore, it is possible to improve workability in installing the supply pipe 5 and the cooling pipe 6 in the combustion furnace 1.

In addition, the blank flange 7 is detachably fixed to the gasifier wall 111. Accordingly, in a case where the supply pipe 5 or the cooling pipe 6 is exchanged during maintenance work, the detachable blank flange 7 can easily be detached from the gasifier wall 111, and can be easily exchanged.

The present invention is not limited to the invention according to the above-described respective embodiments, and can be appropriately modified within the scope not departing from the gist of the present invention For example, according to the present embodiment, the furnace inner tip portion of the cooling pipe 6 is located so as to protrude inward of the furnace as much as the protrusion allowance length L1 from the tip portion of the supply pipe 5. However, in view of the heat resistance and cooling effect of the supply pipe, the furnace inner tip portion of the cooling pipe 6 may not protrude inward of the furnace, and may be located in the vicinity of the tip portion of the supply pipe 5.

REFERENCE SIGNS LIST

1: combustion furnace

2: burner

5: supply pipe

6: cooling pipe

7: blank flange (flange)

8: air supply pipe (oxygen containing gas supply pipe)

9: fuel supply pipe

10: supply pipe the flange portion

12: furnace outer pipe

13: furnace outer pipe flange portion

15: first cooling pipe

16: second cooling pipe

20: seal box

22: fixing member

24: fixing member flange portion

30: coal gasifier (gasifier)

L1: protrusion allowance length 

1. A burner comprising: an oxygen containing gas supply pipe that supplies oxygen containing gas into a furnace; a fuel supply pipe that is coaxially located inside the oxygen containing gas supply pipe so as to supply a fuel and oxygen containing gas; a cooling pipe disposed so as to surround the oxygen containing gas supply pipe; and a flange to which the oxygen containing gas supply pipe and the cooling pipe are fixed, and which is detachably fixed to a furnace wall.
 2. The burner according to claim 1, wherein a tip portion inside the furnace of the cooling pipe is located inside the furnace as much as a predetermined length from a tip portion of the oxygen containing gas supply pipe inside the furnace.
 3. A gasifier comprising: the burner according to claim
 1. 4. A burner attaching method for a burner including an oxygen containing gas supply pipe that supplies oxygen containing gas into a furnace, a fuel supply pipe that is coaxially located inside the oxygen containing gas supply pipe so as to supply a fuel and oxygen containing gas, a cooling pipe disposed so as to surround the oxygen containing gas supply pipe, and a flange to which the oxygen containing gas supply pipe and the cooling pipe are fixed, and which is detachably fixed to a furnace wall, the method comprising: a supply pipe fixing step of fixing the oxygen containing gas supply pipe to the flange; a cooling pipe fixing step of fixing the cooling pipe to the flange; and a flange fixing step of detachably fixing the flange to the furnace wall after the supply pipe fixing step and the cooling pipe fixing step, wherein a position where each of the oxygen containing gas supply pipe and the cooling pipe protrudes inward of the furnace is managed through the flange fixing step.
 5. The burner attaching method according to claim 4, further comprising: a transportation step of transporting the flange to which the oxygen containing gas supply pipe and the cooling pipe are fixed, wherein the supply pipe fixing step and the cooling pipe fixing step are performed at a factory, and wherein the flange fixing step is performed at a job site where the oxygen containing gas supply pipe and the cooling pipe are installed in a combustion furnace having the furnace wall, after the transportation step.
 6. A gasifier comprising: the burner according to claim
 2. 